Cam feed drilling head



Aug. 13, 1935- E. J. KINGSBURY CAM FEED DRILLING HEAD Filed Sept. 19, 1 932 9 Sheets-Sheet 1 3, 1935. E. J. KINGSBURY 2,010,999

CAM FEED DRILLING HEAD Filed Sept. 19, 1932 9 Sheets-Sheet 2 Aug. 13, 1935.

E; J. KINGSBURY CAM FEED DRILLING HEAD Filed Sept. 19, 1932 9 Sheets-Sheet 3 I [dwardJfli'nysbur Aug. 13, 1935. E. J. KINGSBURY CAM FEED DRILLING HEAD Filed Sept. 19, 1952 9 Sheets-Sheet 4 13, 1935- E. J. KINGSBURY CAM FEED DRILLING HEAD Filed Sept. 19, 1932 9 Sheets-Sheet 5 a 3, 1935. E. J. KINGSBURY 2,010,999

CAM FEED DRILLING HEAD 1935- v r E. .1. KINGSBURY 2,010,999

CAM FEED DRILLING HEAD Filed Sept. 19, 1932 9 Sheets-Sheet 7 Q; Q R N R Q} 4 in? \J W) /X ,v a J Q IIIIIIIIIA II,

All!

Aug. 13, 1935. E. J. KINGSBURY 9 CAM FEED DRILLING HEAD Filed Sept; 19, 1952 9 Sheets-Sheet 8 3 1w c/WIM FdwardJ/Ii'nysbuzy 1935- E. J. KINGSBL IRY CAM FEED DRILLING HEAD Filed Sept. 19. 1932 9 Sheets-Sheet 9 I: vlllavllll A Mud #15! Patented Aug. 13, 1935 UNITED STATES PATENT OFFICE CAM FEED DRILLING HEAD Application September 19, 1932, Serial No. 633,888

10 Claims.

This invention relates to machine tool units of the drill type, and more particularly concerns an automatic or semi-automatic unit having a selfcontained power plant and means for rotating and for feeding a tool head.

One of the features of the present invention is the provision of such unit with cam feedin mechanism controlled through a power transmission including a single cam element for controlling the feed of the tool, along with automatic means for controlling the feeding of the tool by said cam. r

Another feature of the present invention is the provision of such a unit with a vertical drive shaft whereby the driving motor may be located above the unit, and coupled thereto by a belt drive so that the speeds maybe varied, with constant motor speed, by simple interchange of pulleys, and without requiring a large space for the reception of the parts. g

A furtherfeature of the invention is the provision of a simple and direct screw adjustment for the position of the general housing with respect to the work, for determining the position of the tool in its feeding movement.

Still another feature of the invention is the pro-' ,set forth on the accompanying drawings which illustrate one form of construction of the device according to the present invention, and in which:

Figure 1 is a side elevation of the unit including the mechanism housing, the motor bracket, the motor and the motor drive system.

Figures la and lb are respectively a side elevation and a top plan view of the mechanism housing, with a modified form of motor bracket.

Figure 2 is a front elevation on a larger scale of the mechanism housing.

Figure 3 is a plan view of the housing, with the cover and drive pulley removed.

Figure 4 is a horizontal section substantially on line 4-4 of Figure 2 showing the housing in bottom plan.

Figure5 is aside elevation of the-housing, with a side plate removed to reveal the cam member.

Figure 6 is a cross sectional view, on a larger scale, substantially on line 6-6 of Figure 5.

Figure 7 is a side elevation, from the side opposite that of Figure 5, with the side plate removed.

Figure 8 is a transverse vertical sectional view substantially on line 8-8 of Figure 5.

Figure 9 is a vertical sectional View through the drive shaft and the spindle, substantially on line 9-9 of Figure 10.

Figure 10 is a vertical transverse sectional view substantially on line vll)lll of Figure 9.

Figure 11 is a similar sectional view substantially on line ll-ll of Figure 9.

Figure 12 is a transverse sectional view substantially on line l2|2 of Figure 9.

Figure 13 is a transverse vertical sectional view substantially on line I3-l3 of Figure 9.

Figure 14 is a detail sectional view substantially on line l4-I4 of Figure 7.

Figure 15 is a circuit diagram.

In the drawings, the unit is illustrated as comprising a general housing H having a drill spindle extending from one end thereof, and provided at its top with a sliding motor bracket B having a vertical support for the self-contained driving motor ,M which is mounted with its shaft vertical and provided at its lower end with a pulley l0 operating by V-belts II to drive the pulley I 2 on the vertical main drive shaft" l3. The main drive shaft l3 extends vertically downward in the housing H and is provided with bearings I4 supported by this housing. A bevel gear, I 5 on drive shaft l 3 meshes with bevel gear teeth "5 on a hollow shaft I! supported by bearings M3 on a cross web of the housing H. The hollow shaft IT has the worm l9 thereon in mesh with- ,the worm wheel of a first cross shaft 2| and is provided internally with axial teeth 22 in mesh with the teeth of a spindle 23 rotatably mounted by bearings 24, 25 in a non-rotatable but axially movable quill 26 having a rack 21 formed thereon for engagement by the teethpf a gear 28 mounted on a second transverse shaft 29. The outer end of the spindle 23 is provided with a tool-holding clutch assembly 30 of any desired type. An. oil and dust-tight seal 3| is preferably provided around the quill 26. Thus, when the motor M turns, the main drive shaft Hi, the hollow shaft l6 and the spindle 23 are driven in rotation so that a drill is rotated for cutting.

v'Ihe transverse shaft 2| is turned at the same time, this shaft (Fig. 10) being provided at one end with a gear 32 which meshes with a large gear 33 (Fig. '7) fixed to a small gear which in turn is in mesh with a large gear 35 on a third transverse shaft 36 having axial teeth 31 thereon for engagement in internal teeth of a clutch collar 38 which may slide along the length of shaft 36 but is connected for positive angular movement therewith. The end 360. of shaft 36 extends into a hollow clutch shaft 39 which is co-axial therewith and has, at its inner end, clutch teeth 40 for engagement by corresponding teeth on the clutch collar 38, so that shafts 36 and 39 may be coupled together at times deter.- mined by the action of the clutch actuating arm M which is fixed to the upper control rock shaft 42 (Figs. 9, 10 and, 11). Clutch shaft 39 has teeth 43 (Figs. 5 and 10) which mesh with the peripheral teeth of the cam wheel 44 mounted on the fourth transverse shaft 44a and having a single cam track 45 (Figs. 5 and 12) cut on its inner face for engagement with the roller 46 mounted on a stub 41 of the rocker arm 48 carried by a transverse pivot 49 and having peripheral rack teeth 50 at its outer end for engagement with a gear 5I mounted on the second transverse shaft 29.

The second transverse shaft 29 carries at its end a limit disk 52 (Figs. 7 and 13) having a pair of stub buttons 53, 54 thereon for cooperation with the lever 55 which actuates the plunger 56 of a circuit closing device 51, shown in detail in Figure 14, and a rock shaft link I6.

This circuit closing device includes an axially movable sleeve 58 which is forced toward the right by a strong spring 59 and thus held in a right hand limit position. An insulating piece 60 has a pair of contact pieces 6| which are connected to conductors 62, 63, and extend through the insulation piece to position opposite a circuit closing bridge 64 carried by a stud 65 moved by the plunger 56. This plunger is normally urged toward the right in Figure 14 by a spring 66 so that it removes the bridge 64 out of engagement with contacts 6 I, as shown in Figure 14. It is preferred to form the plunger .56 as a separate element from an insulated inner end 61 carrying the stud 65, and a separate spring 68 is then provided for the main portion of the plunger. The bridge 64 is movable along the length of stud 65, but is forced toward the left in Figure 14 by a light contact-maintaining spring 69. within a hole in the housing, and is held in position by a fitted ring I0 and the closing plug II. In operation, as the lever 55 presses the plunger 56 toward the left in Figure 14, the springs 66, 68 yield and the bridge 64 closes a circuit across the contacts 6|. Further movement of the lever 55 causes a compression of spring 69, until ultimately the compression forces so transmitted are sufiicient to cause movement of the sleeve 58 and compression of the stronger spring 59, but all the while contact is maintained.

The control rock shaft 42 has a rocker arm I5 (Figs. 7, 9 and 11) pivotally connected at its swinging end to a downwardly extending link I6 which is forced outwardly at its own lower end by a compression spring 11; the assembly of rocker I5 and link I6 being constantly pressed downward (Fig. 11) by. an adjustable spring 'IB (Fi .11). j A

A manually depressible plunger I9 extends horizontally in the housing and, having an inner end of magnetic materiaLfmay be drawn inwardly by a solenoidflljfi ed in thehou'sing; against the action of areturnQspring 8i; The plunger I9 has a pin 82,120 limit'itsfoutwardmovement.

'zontal threaded aperture. This entire assemblage is located The stud 54 on limit disk 52 may engage with the lower end of link I6 during the clockwise movement thereof (Fig. 'I), which corresponds to a withdrawal of the tool from the work, and thereby raise link 'I6 and rock shaft 42 until the clutch teeth 40 are disengaged, against the action of spring I8. Energization of plunger I9, however, causes pin 82 to engage the lower end of link I6 and causes it to rock clockwise (Fig. 11) against the action of spring I'I, until it slips from the end of stud 54, and is thereupon forced downward by the spring I8 to effect engagement of the clutch teeth 40. Obviously, the same operation may be accomplished by manual pressure on the projecting end of plunger I9.

The structure is enclosed by a right hand side plate 90 and a left hand side plate 9|, to protect the several gears and parts: and it is preferred to form a chamber 93 in the base as an oil reservoir, from which oil may be forced by any suitable means (not shown) into ducts 95, 96 (Fig. 9) to various operating parts and basins so that the entire system may be properly lubricated, with a drainage back into the sump chamber 93.

The housing H is slidably mounted in ways on a bed K (Figs. 1 and 2) and, as shown in Figures 2 and 4, one side of the housing H is provided with an inclined surface I00 which cooperates with a correspondingly tapered gib IOI in the ways in bed K. A vertically disposed shaft I92 in the housing is provided at its lower end with teeth engaging in teeth I03 in gib IOI so that, by rotation of the shaft, the gib may be moved to release or to clamp the housing in fixed position with respect to the bed K. The shaft I02 passes upwardly through the housing and extends into a recess I04 (Figs. 3 and 7) and is provided with a hand lever I05 by which it maybe moved to cause the aforesaid linear movement of the gib. A spring pressed plunger I06 is illustrated for maintaining the handle I05 in either end position.

A longitudinal adjustment head H0 is fixedly connected to the bed K and is provided with an outer thrust bearing I I I for a threaded spindle II2 which extends through an oil and dusttight packed opening into the housing H (Fig. 9) and threadedly engages a lug II3 having a hori- Within the adjustment head H0 is provided a worm wheel II4 fixed to the end of spindle H2 and in engagement with a worm II5 on an angularly inclined transverse shaft I I6 (Figs. 3, 8 and 9) provided at its upper end with means for engagement the rotation of the motor drives the pulley I2 and shaft I3 and by gears I5, I6 causes rotation (if'hollow shaft I1 and therewith 0f thedrill spindle 23 and the chuck 30. r

At the same" time, the worm I9 rotatesg'ar 20 and" shaft-f2 I so that'shaft as is turned." stub 53 is now holding '(Fig. 7) the lever 55-for' the en ment-of bridge- 64' with contacttlj. II?

' switch I2I-is closd,the solenoid is energized, and plunger I9 is v drawnlinward to r move; link "I6 from stub 54 ,;so that the link-moves downward under theurgenc y ifs-spri g" 1a ,-ans;rock

, ae.y ne,wtqle wieiss u n (Figs- 10 and 11) and the clutch teeth 40 engage with the teeth on clutch collar 38. Shaft 36 thus drives the hollow shaft 39 and causes a rotation of the cam disk 44 so that its track 45 causes a single rocking movement of the rock lever 48. The teeth 50 of this rock lever rotate gear 5I (Fig. 5, clockwise) and thus rotate shaft 29 and gear 28 (Fig. 9. clockwise), and the quill 26 is forced toward the right in Figure 9, with a feeding\ movement of the tool at a rate controlled by the speed of the motor and by the shape of the cam track 45. Drilling is thus accomplished.

During the initial movement of shaft 29, stub 53 withdraws from lever and the bridge 64 may retreat from contact BI and thus open the solenoid circuit, so that the plunger I9 is released and moves back into the position shown in Figure 11, by the action of a spring BI. The continued movement of disk 52' also results in a downward or counterclockwise movement of stub 54 (Fig. '7) with respect to the lower end of the link I6, until ultimately this link is snapped back to a position above stub 54 by the action of spring 11.

At the completion of the drilling or similar operation, the shape of the cam track 45 causes a reverse movement of the rock lever 48 and therewith a counter-clockwise movement of gear 5| (Fig. 5) and a counter-clockwise movement of gear 28 (Fig. 9) so that the quill 26 and the chuck 30 are withdrawn from the work. Toward the end of this reverse rotation of shaft 29, the disk 52 begins raising the link 16, and

' this movement continues until rock shaft 42 has been moved tov disengage the clutch collar 38 from the teeth 40: the feeding of the tool is thus interrupted. If the switch I 22 is held closed, stub 53 moves lever 55 and again closes the circuit by bridge 64 so that the above feeding movement is repeated, and will be repeated so long as switch I2I remains closed.

If switch I2I is momentarily closed to initiate the movement, the quill 26 is fed forward and then withdrawn once only.

It will be noted also that the device may be set in motion manually by depressing the plunger I9 even though current is not being supplied through conductors I20 and switch 'I2I'.

While any desired type of tool chuck 30 may be employed, a preferred form is shown in Figures 3, 5, 6 and 9 as comprising an external sleeve I33 having an external thread I3I to receive an external nut I32 which is cut away (Figs. 3 and 5) to reval the graduations I33 on the end of the external sleeve I39. An internal member I 34 to receive the drill or like shank is provided with threads at its ends to engage an internal nut I35 having micrometric indications I35 (Fig. 3) thereon for reading in conjunction with the indications I33. This arrangement cooperates with the aforesaid construction of the housing and bed for attaining a very close adjustment of the working of the tool and its position at the limit of the forward movement of the quill 26.

In Figure 15 the supply conductors I 20 may supply current through branch conductors IN and a manually closable switch I22 to the solenoids 80 of three units R, S, T, in multiple, so that these solenoids are operated together when the switch I22 is closed. These units are provided with the individual quills 26 each having .a drill spindle and drill, in this illustrated form, for operating upon a piece of work W held between a fixed-clamp piece I 23 and a movable clamp piece I 24 which may be engaged tightly with the work by a rotatable clamping cam I 25 having a shoulder thereon for engagement by the locking plunger I26, so that the work, when clamped, is latched against release so long as the plunger I26 is held against the cam shoulder by its spring I21. That is, when the switch I22 is closed, each unit operates for its individual oper ation, and then returns to its withdrawn position. Under these conditions, as described above, the bridge 64 of each unit engages the contacts SI of the unit to close a circuit between the contacts. A conductor I28 extends from one main conductor I20 to one terminal of the closing switch of the unit T, a conductor I28 connects the other terminal of this closing switch with one terminal of the closing switch in unit S, a conductor I39 connects the other terminal of the closing switch in unit S to one terminal of the closing switch in unit R, and a return conductor I3I joins the other terminal of the closing switch of the unit R with the solenoid I32 and thus back to the other main con ductor I20. Since the closing switches of the units T, S, R are joined in series by these con-" ductors, the circuit is not energized until all units have returned to the withdrawn position, i. e. until they have finished their individual operations. When this has occurred. the solenoid I32 is energized and its bridge I33 closes a circuit by conductor I34 through the solenoid I35 and by conductors I35 and I3! back to the other main conductor I20. Solenoid I35 then operates to withdraw the plunger I26 so that the cam I25 is released, and the work clamps I24, I 23 may be separated to'r-elease the work W. This construction, therefore, permits an interlocking of the several units, so that their operations may begin at the same time, and so that an auxiliary operation cannot be initiated until each of the working units has reached a predetermined position.

In the form of construction shown in Figures 1a and 1b the motor bracket has been modified so that the motor is supported at the rear of the housing instead of at the top thereof. The housing H is provided as before with upstanding bolts I45! which pass through slots in the horizontal portion I4I of the motor bracket, this horizontal portion being provided with downwardly extending lateral portions I42 cooperative with the top of the housing to permit a sliding movement of the motor and its shaft whereby to adjust the tension of the driving belts. This motion may be produced, and limited by a regulating screw I43 which acts to force the motor bracket toward the left as it is screwed in, and thus to tighten the belts. The horizontal portion MI is integral with spaced downwardly extending legs I44, having a web plate I45 between them for supporting the motor M. Likewise integral with the portion I4I I44 of the motor bracket is a guard I45 which extends over the motor pulley I0 and the unit pulley I4.

By this modified construction, the height of the entire structure is reduced, but the horizontal extension in length is increased. In each construction, the motor is supported adjustably upon the housing itself, and moves to and fro with the housing so that adjustments accomplished through the spindle I I2 do not affect the tension of the driving belt.

It is obvious that the invention may be modified in many ways without departing from the claim as new and desire to secure by Letters Patent, is:-

1. In an apparatus of the class described, a drill spindle and a driving device therefor, a first shaft having thereon means for moving the spindle back and forth according to the direction and amount of movement of said first shaft; means for turning said first shaft cyclically first in one direction and then the other and including a pinion on said shaft, a rack for moving said pinion, a rotatable cam for moving said rack, a disconnecting clutch, and a source of power operative through said clutch to rotate said cam; a rocker member operatively connected for engaging and disengaging said clutch, an abutment carried by said first shaft, means operated by said abutment when the first shaft moves the spindle into withdrawn position for moving the rocker member to disengage the clutch whereby to terminate a cycle, said moving means including a manually movable part operative when moved for separating said abutment and abutment-operated means, and a spring for moving said rocker member to engage said clutch whereby to start a new cycle when said part has been moved to interrupt'such operative relation.

:2. In a device of the class described, a drill spindle and a driving device therefor, a first shaft having thereon means for moving the spindle back and forth according to the direction and amount of its own movement, an eccentric device mounted on said first shaft, a second shaft, a cam rotated by said second shaft, means moved by said cam for turning said first shaft cyclically first in one direction and then the other, a first clutch element connected to said second shaft, a second clutch element movable relative to said first clutch element, means for rotating said second clutch element in one direction, a rock shaft having fixed thereto a device operative for engaging and disengaging said clutch elements, means operated by said eccentric device when the spindle moves into withdrawn position for moving said rock shaft to disengage said clutch elements, manually movable means operable to dislodge the said disengaging means from said eccentric device, and a spring for moving said rock shaft for engaging said clutch elements upon such dislodgment.

3. In an apparatus of the class described, a drill spindle and a driving device therefor, a first shaft having thereon means for moving the spindle back and forth according to the direction and amount. of movement of said first shaft, a cam, devices moved by said cam for turningsaid first shaft cyclically first in one direction and then the other, a source of power, a disconnecting clutch for coupling said source for rotating said cam, a rocker member operatively connected for engaging and disengaging said clutch, an abutment carried by said first shaft, a link pivoted eccentrically on said rocker member and engaged and operated by said abutment when the first shaft moves the spindle into withdrawn position for moving the rocker member to disengage the clutch whereby to clutch whereby to start'a new cycle when said link has been swung away from engagement with said abutment.

4. An apparatus as in claim 3, in which the pivotal connection of said rocker member is at during the forward movement of the spindle which occurs during the new cycle.

'5. An apparatus as in claim 1, including a manually slidable member operative for movingsaid part to dislodge it from said abutment, said sliding member including an externally projecting end for manualoperation, a solenoid for moving said slider to effect such dislodgment, and a spring for returning the slider.

6. A machine tool including a plurality of compact self-contained independently operated drilling units; each unit comprising a rotatable and translatable tool spindle, feeding means for advancing and retracting said spindle, a motor mounted with said drilling unit for rotating the spindle and operating said feeding means, a disconnecting clutch included in said feeding means, a control device for said clutch including spring means for engaging said clutch, an actuating link connection engageable and moved by the feeding means for disengaging said clutch and holding it disengaged upon completion of a cycle of operations of said spindle, and a solenoid operative upon the link connection for releasing the engagement of the same with the feeding means so that said spring means may re-engage said clutch to start a new cycle; and an electrical contactor and means supplied therethrough for energizing the solenoids of all said units simultaneously.

'7. A compact self-contained drilling unit consisting of a frame with a fiat base, a tool spindle mounted in the frame for rotation and for reciprocation parallel to the base, a driving device for rotating the spindle, means for feeding ,said spindle and including a rotatable cam mounted with its axis transverse to a plane intersecting the axis of the spindle, transmission devices connecting said cam with said driving device and including a shaft parallel to the axis of the cam, a disconnecting clutch on said shaft, a spring for normally engaging said clutch, a rock shaft extending substantially parallel to said spindle, an arm on said rock shaft for engaging and disengaging said clutch, a second arm on said rock shaft, a link pivoted to said second arm eccentric to the axis of said rock shaft, an abutment moved by said cam and engageable with said link for operating the same positively to disengage said clutch and therewith terminate a cycleof movement of the spindle, a movable member operative for moving said link about its pivot connection with said second arm to dislodge the link from engagement with said abutment whereby to permit said spring to re-engag'e the clutch to start a new cycle, said movable member including a portion accessible from the exterior of the frame formanual operation.

8. An apparatus as in claim 7, in which said portion operates as an external visual indicator -of the position of said movable member, and; a

solenoid is located within the frame for moving said movable member to effect such dislodgment, and in which a springis provided for returning the movable member whenthe solenoid is disengaged. r

9. A compact self-contained drilling unit con- 9 sisting of a frame having a fiat base,a tool spindle mounted in said frame for rotation and for reciprocation parallel to said fiat base, said frame having sides substantially parallel with said spindle, a driving device for'said spindle,

feeding means for said spindle including a cam, transmission devices connecting said cam with said driving device and including a disengaging clutch, a rocker member-operatively connected for engaging and disengaging said clutch, an abutment moved by said cam, means operated by said abutment upon the completion of a cycle of cam movement for positively moving the rocker member to disengage the clutch and including a part movable for interrupting the positive engagement between said abutment and the rocker member, a spring for moving said rocker member to engage said clutch whereby to start a new cycle when said part has been moved to interrupt such positive relation, 2, slidable member operative for moving said part out of its position of said positive connection between the abutment and the rocker member, a solenoid operative when energized from a remote point of control for moving said slidable member to cause said disengagement, and a spring for returning the slidable member when the solenoid is de-energized; all said driving, feeding, transmitting and controlling elements and means being located between the said parallel sides of said frame and enclosed thereby.

10. A machine tool comprising a frame, a rotatable and translatable tool spindle, a feeding mechanism including devices for cylically advancing and retracting said'spindle, said feeding mechanism including a source of power and a clutch which may be opened to stop the translational movement of said spindle, a spring for engaging said clutch, a member operative upon movement in one direction for opening said clutch, abutment means moved in unison with the spindle for engaging said member toward the end of the retracting movement of said spindle whereby to move it in said one direction for opening the clutch and terminating a working cycle, said member and abutment means cooperating to maintain said clutch in open position, said member being also movable in a. direction at an angle -to said first direction whereby to release the engagement between said member and said abutment means so that the spring may engage the clutch to start a new cycle, and means operating during the course of the cycle to restore said member to a position for again engaging said means to efiect the termination of the new cycle.

EDWARD JOSLIN KLNGSBURY. 

